使用 parted 调整磁盘分区大小
2015-08-04 by dongnan
环境
CentOS 6.6 amd64
目标
- 使用
parted调整磁盘扩展分区大小。 - 使用
parted创建4k对齐的分区。
举个栗子
调整分区
查看磁盘信息，注意Free关键字，我们要把这些可用空间划分到扩展分区中。
(parted) print free # 输入命令
Model: Xen Virtual Block Device (xvd)
Disk /dev/xvda: 107GB
Sector size (logical/physical): 512B/512B
Partition Table: msdos
Number Start End Size Type File system Flags
32.3kB 1049kB 1016kB Free Space
1 1049kB 420MB 419MB primary ext4 boot
2 420MB 43.4GB 42.9GB primary lvm
3 43.4GB 75.2GB 31.8GB extended
5 43.4GB 75.2GB 31.8GB logical ext4
75.2GB 107GB 32.2GB Free Space
选择扩展分区
(parted) resize 3
WARNING: you are attempting to use parted to operate on (resize) a file system.
#...省略
will be removed in an upcoming release.
Start? [43.4GB]? #回车
End? [75.2GB]? 107GB #输入
Warning: WARNING: the kernel failed to re-read the partition table on /dev/xvda (Device or resource busy). As a result, it may not reflect all
of your changes until after reboot.
查看调整后的分区信息
print
Model: Xen Virtual Block Device (xvd)
Disk /dev/xvda: 107GB
Sector size (logical/physical): 512B/512B
Partition Table: msdos
Number Start End Size Type File system Flags
1 1049kB 420MB 419MB primary ext4 boot
2 420MB 43.4GB 42.9GB primary lvm
3 43.4GB 107GB 64.0GB extended
5 43.4GB 75.2GB 31.8GB logical ext4
调整后的分区3（扩展分区）64.0GB，有可用的空间用于创建新分区。
创建新的逻辑分区
(parted) mkpart # 命令
Partition type? primary/logical? logical # 命令
File system type? [ext2]? ext4 # 命令
Start? 75.2GB # 命令
End? 107GB # 命令
Warning: WARNING: the kernel failed to re-read the partition table on /dev/xvda (Device or resource busy). As a result, it may not reflect all
of your changes until after reboot.
查看创建的分区
(parted) p
Model: Xen Virtual Block Device (xvd)
Disk /dev/xvda: 107GB
Sector size (logical/physical): 512B/512B
Partition Table: msdos
Number Start End Size Type File system Flags
1 1049kB 420MB 419MB primary ext4 boot
2 420MB 43.4GB 42.9GB primary lvm
3 43.4GB 107GB 64.0GB extended
5 43.4GB 75.2GB 31.8GB logical ext4
6 75.2GB 107GB 32.2GB logical
分区6就是新创建的逻辑分区。
创建4k对齐的分区
parted /dev/xvdb
#...省略
(parted) mkpart primary ext4 1 100%
两条命令等效
(parted) mkpart primary ext4 2048s 100%
查看分区信息
fdisk -lu /dev/xvdb
#...省略
Device Boot Start End Blocks Id System
/dev/xvdb1 2048 2147483647 1073740800 83 Linux